Description
Key Technical Specifications
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Model Number: DS200FCRLG1A
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Manufacturer: General Electric (GE)
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Function: Firing-pulse generation + analog regulation for thyristor / IGBT power stage
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Input Monitoring: Gen. terminal voltage 0-15 kV (via PT 100 V), stator current 0-20 kA (via CT 5 A), field current 0-5 kA (Hall / shunt)
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Control Output: 4-20 mA to SCR firing board (trigger-angle), 2 × Form-C relays 250 V 5 A for alarm / mode switch
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Control Loop: PID + feed-forward; response ≤ 100 ms; accuracy ≤ ±0.5 % V, ≤ ±1 % If
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Power Supply: 220 V AC (±15 %) or 24 V DC (±10 %); 30 W typical, 50 W max
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Isolation: 1.5 kV channel-to-ground; 500 V logic-to-power
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Protection: Over-voltage (≥ 115 % Vnom), over-current (≥ 120 % Ifnom), under-excitation, field break detection
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Operating Temperature: –30 °C…+70 °C; 5-95 % RH non-condensing
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Dimensions / Weight: 250 × 180 × 80 mm, ≈ 2.5 kg; rack mount
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Certifications: CE, UL, IEC 61800-7, GB/T 7409.3
Field Application & Problem Solved
A 150 MW steam-turbine generator in a refinery drops voltage when the cracked-gas compressor starts. The DS200FCRLG1A sits in the Mark V exciter rack—reads 10 kV PT, 8.7 kA CT, and 1.2 kA field shunt, then slams the SCR firing angle from 75° to 55° in 80 ms to push field current to 1.35 kA. Terminal volts stay within ±0.5 %, the motor doesn’t stall, and the plant avoids a flaring event. Value: one board replaces the old analog regulator + firing card, frees four rack slots, and gives the DCS a 4-20 mA loop for remote set-point.
A 150 MW steam-turbine generator in a refinery drops voltage when the cracked-gas compressor starts. The DS200FCRLG1A sits in the Mark V exciter rack—reads 10 kV PT, 8.7 kA CT, and 1.2 kA field shunt, then slams the SCR firing angle from 75° to 55° in 80 ms to push field current to 1.35 kA. Terminal volts stay within ±0.5 %, the motor doesn’t stall, and the plant avoids a flaring event. Value: one board replaces the old analog regulator + firing card, frees four rack slots, and gives the DCS a 4-20 mA loop for remote set-point.
Installation & Maintenance Pitfalls (Expert Tips)
PT/CT secondaries must be shorted during swap – The board lives on 100 V PT and 5 A CT. Pull the module without shorting CT and you’ll open-CT the winding—arc flash follows. Use the supplied shorting blocks.
4-20 mA shield ground at one end only – The output drives the SCR trigger board. Ground both ends and the 100 ms firing pulses ride the shield, giving you ±2 % voltage ripple you can’t tune out.
Relay contacts are dry—no inductive loads – The Form-C contacts are rated 5 A resistive. If you fire a 24 Vdc contactor coil without a snubber the inductive kick welds the contacts and you lose the “Mode-Fault” alarm.
Ignore the 30 W heat-sink – At 70 °C ambient the regulator FET runs 110 °C and throttles gain. Keep 50 mm free air or add a 24 Vdc fan; otherwise you’ll chase “slow response” faults every summer afternoon.
PT/CT secondaries must be shorted during swap – The board lives on 100 V PT and 5 A CT. Pull the module without shorting CT and you’ll open-CT the winding—arc flash follows. Use the supplied shorting blocks.
4-20 mA shield ground at one end only – The output drives the SCR trigger board. Ground both ends and the 100 ms firing pulses ride the shield, giving you ±2 % voltage ripple you can’t tune out.
Relay contacts are dry—no inductive loads – The Form-C contacts are rated 5 A resistive. If you fire a 24 Vdc contactor coil without a snubber the inductive kick welds the contacts and you lose the “Mode-Fault” alarm.
Ignore the 30 W heat-sink – At 70 °C ambient the regulator FET runs 110 °C and throttles gain. Keep 50 mm free air or add a 24 Vdc fan; otherwise you’ll chase “slow response” faults every summer afternoon.
Technical Deep Dive & Overview
Internally the DS200FCRLG1A is a 16-bit MCU plus DSP. The MCU handles PID and protection logic while the DSP generates the 16-phase SCR firing pattern at 720 Hz. A 12-bit ADC samples PT/CT/field signals every 1 ms; the DSP updates the firing angle register and pushes the pattern to six fiber-linked gate drivers. All tuning lives in flash; swap the board and the Mark V downloads parameters via the VME back-plane—no handheld unit needed. No battery, no fan—just 24 V or 220 V and the generator stays in sync.
Internally the DS200FCRLG1A is a 16-bit MCU plus DSP. The MCU handles PID and protection logic while the DSP generates the 16-phase SCR firing pattern at 720 Hz. A 12-bit ADC samples PT/CT/field signals every 1 ms; the DSP updates the firing angle register and pushes the pattern to six fiber-linked gate drivers. All tuning lives in flash; swap the board and the Mark V downloads parameters via the VME back-plane—no handheld unit needed. No battery, no fan—just 24 V or 220 V and the generator stays in sync.
